What fraction of electrons-ef does emission represent

Reference no: EM13341953

The concept of thermionic emission is the basis of modern X-ray tubes, which are the workhorse of a medical X-ray image. In this process a filament (a piece of metal in a vacuum) is heated by the application of electrical current. The heat (energy) is transferred to the \'free\' electrons of the metal which allow some electrons to escape from the surface. After a short period of operation the filament has lost enough electrons to give it an overall charge of 1.100 × 10-6 C. How many electrons, ne, has the filament lost? If the filament is 1.55 g of tungsten, what fraction of electrons, ef, does this represent? (HINT: The atomic number of tungsten is 74.0, the atomic weight is 183.8 g/mol and Avogadro\'s constant = 6.02 × 1023 1/mol.)

Reference no: EM13341953

Questions Cloud

Explain what is the specific heat capacity of the alloy : A 17.6-g sample of an alloy at 93.0°C is placed into 50.0 g of water at 22.0°C in an insulated coffee-cup calorimeter with a heat capacity of 9.2 J/K. If the final temperature of the system is 31.1°C, what is the specific heat capacity of the allo..

What other audit techniques could the auditor use : With reference to each one of the five ratios in turn and the other information provided explain what the results of your calculations indicate for Globe Ltd's going concern.

Please note that the onus is on students to organise their : Please note that the onus is on students to organise their affairs so that they can achieve the educational objectives of the course and submit assignments for assessment no later than the due date. The onus is also on the student to provide, if requ..

Calculate the force on a proton due to dipole at location : A dipole is located at the origin, and is composed of charged particles with charge +e and -e, separated by a distance 3 10-10 m along the y axis. The +e charge is on the -y axis.

What fraction of electrons-ef does emission represent : The concept of thermionic emission is the basis of modern X-ray tubes, which are the workhorse of a medical X-ray image. In this process a filament (a piece of metal in a vacuum) is heated by the application of electrical current

Explain what is the formula of the hydrate : Anhydrous CaCl2 has a molecular weight of 110.1 g/mol. A hydrate of CaCl2 has a molecular weight of 219.1 g/mol. What is the formula of the hydrate

Impact the scope of the internal audit function : Briefly discuss the audit committee's involvement in operational analysis, business ethics, financial integrity, non-financial data integrity, and administration of the internal audit function.

Evaluate the molar mass of the acid : You titrate 1.740 g of a solid unknown acid that was dissolved in 100.0 mL of distilled water; the initial pH value was 2.5. You found that pH= pKa=4.2 when 12.50 mL of NaOH was added. The concentration of the sodium hydroxide was 0.500M. Calculat..

How many electrons are missing from each ion : When two identical ions are separated by a distance of 8.3x10^-10m and the electrostatic force each exerts on the other is 5.3x10^-9N How many electrons are missing from each ion

User Account

All Pages